THE GENUS LEBERTIA. 511 



observed. The anterior ends of the first and second pairs of 

 epimera have each a moderately long hair. There are two or 

 three short hairs behind the first segment of the third and 

 fourth pairs of legs. The posterior extremities of the first pair 

 of epimera end in a point about midway between the capitulum 

 and the genital area. The second pair also ends in a point, but 

 this is just at the genital area, where it is fused with the 

 extremities of the third pair. The fourth pair is rather more 

 rectangular, as the inner end is not broader than the outer. The 

 epimera appear to be more fused together in the inner area. 

 The sutures are broad, but not well defined. 



The legs, which are devoid of swimming hairs, do not appear to 

 possess any outstanding features of much moment. The distal 

 end of the sixth segment is little, if any, stouter than the proximal 

 end. The fourth pair of legs lies close up to the suture between 

 the third and fourth pairs of epimera. The first segment has 

 six spines on its extensor surface. The fifth segment has eight 

 to eleven spines and the sixth segment five or six spines on the 

 flexor surface. The claws are of normal form and size. 



The genital area is small. In the female it extends very little 

 beyond the epimera, and in the male not at all. The strong 

 anterior sclerite is roughly triangular in shape. The posterior 

 one is slender and arc shaped. The acetabula do not call for 

 special comment. The posterior one is almost round and much 

 smaller than the two anterior elongated ones. The valves have 

 six to nine large pores along their outer edge, and along the inner 

 edge there are a number of fine hair pores, ranging in the case of 

 the female from twelve to fifteen and in the case of the male from 

 nineteen to twenty-four. 



The anus is surrounded by a strong outer chitinous ring. 



Nymph. 



So far the nymph has not been found among collections outside 

 of Norway. The length appears to range from 0'50 to 0*63 mm., 

 and the breadth 0*45 to 0*55 mm. The colour of the oval-shaped 

 body is about that of the imago, while the skin is covered with 

 fine chitinous parallel ridges. 



The palpi are thick and about 0*22 mm. in length. The first 

 segment has no bristles. The second has three on its extensor 

 surface, of which one is distal. The third segment has three long 



